Pump jack



L. T. BERNARD Nov. 6, 1951 PUMP JACK 2 SHEETS-SHEET 1 Filed Dec. 12, 1946 INVENTOR.

Nbv. 6, 1951 BERNARD 2,573,948

PUMP JACK Filed Dec. 12, 1946 2 SHEETS-SHEET 2 2-- .CD. ID. (i J \a o o ,Z

j HI I II I 5 6 I 2 W V i HI I Bylaw/7 f ggkd l l 5 Z patented Nov. 6, i951 UNITED STATES PATENT OFFICE PUMP JACK Lorn '1'. Bernard, Grand Rapids, Mich.

Application December 12, 1946, Serial No. 715,734

8 Claims. 1.

This invention relates to pump jacks.

The main objects of this invention are- First, to provide a pump jack in which there is aminimum of friction and wear on the moving parts and at the same time one which is economical to produce.

Second, to provide a pum jack in which the bearing parts are efliciently lubricated and at the same time there is no dripping or splashing of lubricant on exposed parts.

Objects relating to details and economies of the invention will appear from the description tofollow. The invention is defined and pointed outin the claims.

A preferred embodiment of the invention is illustrated in the accompanying drawings, in which:

. Fig. 1 is a side elevation of a pump jack embodying the invention with the housing partially broken away.

Fig. 2 is an enlarged fragmentary view mainly in vertical section on a line corresponding to li'rie2-2 of Figs. 3 and 4.

Fig. 3 is a fragmentary view mainly in vertical section on a line corresponding to line 3-3 of Figs. 2 and 4. I t

Fig. 4 is an enlarged fragmentary view partially in horizontal section on a line corresponding to line 4-4 of Fig. 2. I

Fig. 5 is an enlarged fragmentary view partially in section on line 55 of Fig. 4.

In the embodiment of the invention illustrated the support designated generally bythe numeral I is provided with legs or pedestals 2, 2 adapted to be secured to the foundation or platform 3.

The support I comprises a bottom wall 4, side walls 5, 5, and transverse walls 6 and 1, these walls being formed of rolled plates and welded together as conventionally indicated at 8 to provide a rigid supporting structure, the walls being arranged to provide a gear box 9 and a compartment II] which is open at its outer end, the transverse wall 1' being inset from the rear end of the bottom and'side walls. A top plate H for the compartment l is welded to the upper edges of the side walls and the transverse wall 1.

A T-coupling member I2 is welded to the bottom wall below the compartment ID, the bottom wall having an opening [3 and the top wall an opening [4 aligned therewith to receive the upper pump cylinder I which is arranged through the opening and threaded into the upper end of the T-coupling'.

The well pipe I6 is connected to the lower end the pairs of guide rods 22.

2 of the T-coupling by means of the union comprising the members I? and IS. The delivery pipe [9 is threaded into the branch 20 of the T-coupling.

The support is provided with sockets 2| for These guide rods are connected at their upper ends by the platelike top member 23 which serves as a tie memher for the guide rods and as a support for the motor 24 and also as a top for the housing 25 which embraces the moving parts except the driving pulley 26 and the belt 21, The uide rods are welded at 22 l The driving pulley 26 is mounted on the outer end of the drive shaft 28 which is supported by roller bearings designated generally by the numeral 29 mounted in openings 30 provided therefor in the transverse walls 6 and 1 of the support. Y s

The driven shaft 3| is mounted transversely of the drive shaft in roller bearings 29 mounted in openings 38 provided therefor in the side walls of the housing. The driving worm gear 32 is mounted on the drive shaft while the driven coacting gear 33 is mounted on the driven shaft. These shafts andgears' are within the gear box which is adapted to contain lubricant. The roll- 61'" bearings are in communication With the gear box to receive lubrication therefrom.

The gear box is provided with a cover 34. The driven shaft projects at each side and has cranks 35 on the projecting ends, the cranks being provided with crank pins 36. The cranks are connected to shaft 31 of the cross head 38 by means of connecting rods or pitman 39. Lubricant packed roller bearings 40 are provided at each end of the connecting rods for periodic lubrication at these points. It has been found that a packed bearing will perform satisfactorily for a long period of time.

The crosshead is provided with peripherally grooved guide rollers 4| disposed between and coacting with the pairs of guide rods. A slight or small amount of clearance is provided between the rollers and the guide rods so that the rollers are in rotating engagement with only one guide rod of a pair oneach stroke of the crosshead. The location of the cranks at one side of the guide rods results in some lateral thrust on the crosshead rollers which secures this result with a very slight amount of clearance. This arrangement minimizes wear on the rollers and uide rods.

The pump or plunger rod 42 is provided with a plunger 43 coacting with the upper cylinder E5; the lower plunger is not illustrated. The embodiment of the invention illustrated is of a pressure pump type and is commonly used in connection with a storage tank not illustrated. In such pressure storage tanks, it is desirable to maintain a suitable volume of air and to that end I provide an air pump cylinder 44 and coacting plunger 45 which is connected by the plunger rod 46 and the coupling block 41 to the crosshead shaft 31.

The pump cylinder 44 is provided with a delivery pipe 48 delivering to the top of the tank. A discharge valve designated generally by the numeral 59 is provided at the bottom of the air pump cylinder. 7

The structure illustrated embodying the invention may be very economically produced and with a relatively small amount of materialthat is, considered from the weight angle and at the same time is very strong and rigid and durable. While the moving parts are efiiciently lubricated there is no splashing or dripping of oil such as is quite commonly incident to pumping jacks or pump power heads embodying lubricant circulating systems or one in which the bearings are provided with oil cups which require frequent attention.

I have illustrated and described my invention in a highly practical embodiment thereof. I have not attempted to illustrate certain modifications and adaptations which I contemplate as it is believed that this disclosure will enable those skilled in the art to embody or adapt my invention as may be desired.

Having thus described my invention,-what I claim as new and desire to secure by Letters Patent, is:

1. In a pump jack, the combination of a support comprising a bottom and side and transverse walls arranged and welded together to provide a rigid support structure including a gear box adapted to contain lubricant, and a compartment at the inner end of the gear box, said compartment having a top integrally connected to the upper edges of the side and inner transverse walls, a T-coupling welded to the bottom below said compartment, the bottom and compartment top having openings therein aligned with said T-coupling, an upper cylinder arranged through said openings and threaded into said coupling, a well pipe connected to said coupling, a drive shaft provided with roller bearings carried by said transverse walls, a driven shaft provided with roller bearings carried by said side walls, said roller bearings being in communication with said gear box to receive lubricant therefrom, a worm on said drive shaft, a coacting worm gear on said driven shaft, both arranged within said gear box, the ends of said driven shaft projecting from said side walls and having cranks thereon provided with crank pins, two spaced pairs of crosshead guide rods carried by and projecting upwardly from said support above its said compartment, a top member mounted on the upper ends of said guide rods and constituting a tie member therefor and a motor support and housing top, a crosshead provided with a shaft disposed between the guide rods of each pair of guide rods and projecting beyond said pairs of guide rods, connecting rods for the pins of said cranks to the projecting ends of said crosshead shaft, peripherally grooved rollers on said crosshead shaft coacting with said guide rods, one roller being disposed between and coacting with the guide rods of one of said pairs and the other roller being disposed between and coacting with the guide rods of the other pair, said connecting rods and rollers being provided with lubricant packed ball bearings, there being a slight clearance between the crosshead rollers and said guide rods so that the rollers are in rota-ting engagement with only one guide rod of the pair on each stroke of the crosshead, a plunger rod connected to said crosshead between said rollers and provided with a plunger coacting with said upper cylinder and extending into said well pipe, said cylinder being disposed between the plane of one pair of guide rods coacting with one roller and the plane of the other pair of guide rods coacting with the other roller, a cover for said gear box, and a housing attached to said top member and extending downwardly therefrom.

2. In a pump jack, the combination of a support comprising a bottom and side and transverse walls arranged and welded together to provide a rigid support structure including a gear box adapted to contain lubricant, and a compartment at the inner end of the gear box, said compartmerit having a top integrally connected to the upper edges of the side and inner transverse walls, a T-coupling welded to the bottom below said compartment, the bottom and compartment top having openings therein aligned with said T-coupling, an upper cylinder arranged through said openings and threaded into said coupling, a well pipe connected to said coupling, a drive shaft provided with roller bearingscarried by said transverse walls, a driven shaft provided with roller bearings carried by said side walls, said roller bearings being in communication with said gear box to receive lubricant therefrom, a

worm on said drive shaft, a coacting'worm gear,

on said driven shaft, both arranged within said gear box, the ends of said driven shaft projecting from said side walls and having cranks thereon provided with crank pins, two spaced pairs of crosshead guide rods carried by and projecting upwardly from said support above its said compartment, a crosshead provided with a shaft disposed between the guide rods'of each pair of guide rods and projecting beyond said pairs of guide rods, connecting rods for the pins of said cranks to the projecting ends of said crosshead shaft, peripherally grooved rollers on said crosshead shaft coacting with said guide rods, one roller being disposed between and coacting with the guide rods of one of said pairs into said well pipe, said cylinder being disposed between the plane of one pair of guide rods coacting with one roller and the plane of the other pair of guide rods coacting with the other roller.

3. In a pump jack, the combination of a support comprising a bottom and side and transverse walls arranged to provide a gear box, a coupling secured to the support at one end of the gear box, an upper cylinder carried by said coupling, a well pipe connected to said coupling,

a-drive shaft provided with roller bearingscarried by opposed walls of said wallsja driven shaft provided-with bearings car-ried by opposed walls of said walls," said bearings being in communication with'said' gear box to receive lubricant therefrom, coacting gears on said shafts arranged withinsaid gear box, the ends of said driven shaft projecting from the gear box and having cranks thereonftwo spaced pairs of crosshead guide rods carried by and projecting upwardly from said support, a top member mounted on the upper ends of said guide rods and constituting a tie member thereforand amotor support and housing top, a crosshead providedwitlra shaft disposed between the guide rods of each pair of guide rods and projecting beyond said pairs of guide rods, connecting rods for the said cranks to said crosshead shaft, peripherally grooved rollers onsaid crosshead shaft coaotingwith said guide rods, oneroller being disposed between and coacting with the guide rods of one of said pairs and, the other roller being disposed between. and coacting with the guide rods of, the other pair, said connecting rods and rollers-being provided with lubricant packed bearings, there being a clearance between the crosshead rollers and said guide rods so that the rollers "are in rotating engagement with only one guide rod of the pair on each stroke of the crosshead, a plunger rod connected to said crosshead between said rollers and provided with a plunger coacting with said upper cylinder and extending into said well pipe, said cylinder being disposed between the plane of one pair of guide rods coacting with one roller and the plane of the other pair of guide rods coacting with the other roller, a cover for said gear box, and a housing attached to said top member and extending downwardly therefrom.

4. In a pump jack, the combination of a support comprising a bottom and side and transverse walls arranged to provide a gear box, a coupling securedto the support at one end of the gear box, an upper cylinder carried by said coupling, a well pipe connected to said coupling, a drive shaft provided with roller bearings oarried by opposed walls of said walls, a driven shaft provided with bearings carried by opposed walls of said walls, said bearings being in communication with said gear box to receive lubricant therefrom, coacting gears on said shafts arranged within said gear box, the ends of said driven shaft projecting from the gear box and having cranks thereon, two spaced pairs of crosshead guide rods carried by and projecting upwardly from said support, a crosshead provided with a shaft disposed between the guide rods of each pair of guide rods and projecting beyond said pairs of guide rods, connecting rods for the said cranks to said crosshead shaft, peripherally grooved rollers on said crosshead shaft coacting with said guide rods, one roller being disposed between and coacting with the guide rods of one of said pairs and the other roller being disposed between and coacting with the guide rods of the other pair, said connecting rods and rollers be ing provided with lubricant packed bearings, there being a clearance between the crosshead rollers and said guide rods so that the rollers are in rotating engagement with only one guide rod of the pair on each stroke of the crosshead, and a plunger rod connected to said crosshead between said rollers and provided with a plunger coacting with said upper cylinder and extending into said well pipe, said cylinder being disposed between the plane of one pair of guide rods oos asis actingwithone roller and the plane of the other pair of guide rods coacting with the other roller.

5. In a pump jack, the combination ofa support comprising a bottom and side and transverse walls arranged to provide a gear box, a drive shaft provided with bearings carried by opposed walls, a driven shaft provided with bearings carried by opposed walls of said gear box, coacting gears on said shafts arranged within said gear box, the ends of said driven shaft projecting from the gear box and having cranks thereon, two spaced pairs of crosshead guide rods carried by and projecting upwardly from said support, a top member mounted on the upper ends of said guide rods and constituting a tie member therefor and a motor support and housing top, a motor mounted on said top member, driving connections between said motor and said drive shaft, a crosshead provided with a shaft disposed between the guide rods of each pair of guide rods and projecting beyond said pairs of guide rods, connecting rods for the said cranks to said crosshead shaft, peripherally grooved rollers on said crosshead shaft coacting with said guide rods, one roller being.disposed between and coacting with the guide rods of one of said pairs and the other roller being disposed between and coacting with "the guide rods of the other pair, a plunger rod connected to said crosshead between said rollers, a cover for said gear box, and a housing attached to said top member and extending downwardly therefrom.

6. In a pump jack, the combination of a support comprising a bottom and side and transverse walls arranged to provide a gear box, a drive shaft provided with bearings carried by opposed walls, a driven shaft provided with bearings carried by opposed walls of said gear box, coacting gears on said shaf-ts arranged within said gear box, the ends of said driven shaft projecting from the gear box and having cranks thereon, two spaced pairs of crosshead guide rods carried by and projecting upwardly from said support, a crosshead provided with a shaft disposed between the guide rods of each pair of guide rods and projecting beyond said pairs of guide rods, connecting rods for the said cranks to said crosshead shaft, said gear box and said two spaced pairs of guide rods being disposed between said connecting rods, peripherally grooved rollers on said crosshead shaft coacting with said guide rods, one roller being disposed between and coacting with the guide rods of one of said pairs and the other roller being disposed between and coacting with the guide rods of the other pair, and a plunger rod connected to said crosshead between said rollers.

'7. In a pump jack, the combination of a support provided with a gear box adapted to contain lubricant, a, drive shaft, a driven shaft, said shafts being provided with bearings carried by walls of the gear box, said bearings being in communication with said gear box to receive lubricant therefrom, coacting gears on said shafts arranged within said gear box, the ends of said. driven shaft projecting from the gear box and having cranks thereon, two spaced pairs of crosshead guide rods carried by and projecting upwardly from said support, a top member mounted on the upper ends of said guide rods and constituting a tie member therefor and a motor support and housing top, a motor mounted on said top member, driving connections between said motor and said drive shaft, a crosshead provided with a shaft disposed between the guide rods of each pair of guide rods and projecting beyond said pair's of guide rods, connecting rods for the said cranks to said crosshead shaft, peripherally grooved rollers on said crosshead shaft coacting with said guide rods, one roller being disposed between and ooacting with the guide rods of one of said pairs and the other roller being disposedbetween and coacting with the guide rods of the other pair, said connecting rods and rollers being provided with lubricant packed bearings, a plunger rod connected to said crosshead between said rollers, a cover for said gear box, and a housing attached to said top member and extending downwardly therefrom.

8. In a pump jack, the combination of a support provided with a gear box adapted to contain lubricant, a drive shaft, a driven shaft, said shafts being provided with bearings carried by walls of said gear box, said bearings being in communication with said gear box to receive lubricant therefrom, coacting gears on said shafts arranged within said gear box, the ends of said driven shaft projecting from the gear box and having cranks thereon, two spaced pairs of crosshead guide rods carried by and projecting upwardly from said support, a crosshead provided with a shaft disposed between the guide rods of each pair of guide rods and projecting beyond said pairs of guide rods, connecting rods for the said cranks to said crosshead shaft, said gear box and said two spaced pairs of guide rods being disposed between said connecting roa ts; ripher'ally grooved rollers on said crosshead shaft coacting with said guide rods, one roller being disposed between and coacting with the guide rods of one of said pairs and the other roller being disposed between and coacting with the guide rods of the other pair, said connecting rods and rollers being provided with lubricant packed bearings, and a plunger rod connected to said crosshead between said rollers.

LORN T; EERNARD;

REFERENCES CITED The following references are df record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,708,577 Hunter Apr. 9, 1929 1,749,892 Scholes Mar. 11, 1930 1,816,190 Meyers July 28, 1931 2,038,125 Patterson Apr. 21, 1936 2,045,552 Mann June 23, 1936 2,078,480 Burks Apr. 27, 1937 2,214,570 'Bangasser Sept. 10, 1940 FOREIGN PATENTS Number Country Date 662,852 France Aug. 13, 1929 

